Tunnel Considerations

Tunnels are not just holes in the ground,
each tunnel is different and each requires a different approach to how
it is built, what lighting and ventilation is needed, how much drainage
and falling rock support is needed, etc.

The route of the BorderTransportationSystem does bump into
mountains and large hills that may require cuts through the terrain or
tunnels through the terrain. The route tries to avoid as many of
these situations as it can, but the fact remains that there will be
tunnels along the route.